According to STATZ more than 430 stone blocks have been broken. But AR doesn't flag the path4 as completed.
<>
Path4:
prerequisites:
world:
value: world
completed paths:
value: Path3
requirements:
blocks broken:
value: STONE;430;Stones
results:
message:
value: Congratulations, you completed the fourth path!
options:
display name: Path4
is repeatable: false
auto choose: true
<>

When I change it to 1,0;430,Stones it works.